Plains Resources Inc Watch

from SC 13D/A 1 page Exhibit 1 Agreement This Will Confirm the Agreement by and Among All the Undersigned That the Schedule 13d Filed on or About This Date With Respect to the Beneficial Ownership of the Undersigned of Shares of the Common Stock of Plains Resources Inc. Is Being Filed on Behalf of Each of the Entities Named Below. This Agreement May Be Executed in Two or More Counterparts, Each of Which Shall Be Deemed an Original, but All of Which Together Shall Constitute One and the Same Instrument. Dated: July 21, 2004 Leucadia National Corporation By: /S/ Joseph A. Orlando Name: Joseph A. Orlando Title: Vice President and Chief Executive Officer Pershing Square, L.P. By: Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member By: /S/ William Ackman Name: William Ackman

from SC 13G 1 page Joint Filing Agreement

from SC 13D/A 1 page Exhibit 1 Agreement This Will Confirm the Agreement by and Among All the Undersigned That the Schedule 13d Filed on or About This Date With Respect to the Beneficial Ownership of the Undersigned of Shares of the Common Stock of Plains Resources Inc. Is Being Filed on Behalf of Each of the Entities Named Below. This Agreement May Be Executed in Two or More Counterparts, Each of Which Shall Be Deemed an Original, but All of Which Together Shall Constitute One and the Same Instrument. Dated: July 15, 2004 Leucadia National Corporation By: /S/ Barbara Lowenthal Name: Barbara Lowenthal Title: Vice President and Comptroller Pershing Square, L.P. By: Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member By: /S/ William Ackman Name: William Ackman

from SC 13D/A 1 page Exhibit 1 Agreement This Will Confirm the Agreement by and Among All the Undersigned That the Schedule 13d Filed on or About This Date With Respect to the Beneficial Ownership of the Undersigned of Shares of the Common Stock of Plains Resources Inc. Is Being Filed on Behalf of Each of the Entities Named Below. This Agreement May Be Executed in Two or More Counterparts, Each of Which Shall Be Deemed an Original, but All of Which Together Shall Constitute One and the Same Instrument. Dated: July 7, 2004 Leucadia National Corporation By: /S/ Joseph A. Orlando Name: Joseph A. Orlando Title: Vice President and Chief Financial Officer Pershing Square, L.P. By: Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member By: /S/ William Ackman Name: William Ackman

from SC 13D/A 1 page Exhibit 1 Agreement This Will Confirm the Agreement by and Among All the Undersigned That the Schedule 13d Filed on or About This Date With Respect to the Beneficial Ownership of the Undersigned of Shares of the Common Stock of Plains Resources Inc. Is Being Filed on Behalf of Each of the Entities Named Below. This Agreement May Be Executed in Two or More Counterparts, Each of Which Shall Be Deemed an Original, but All of Which Together Shall Constitute One and the Same Instrument. Dated: May 26, 2004 Leucadia National Corporation By: /S/ Joseph A. Orlando Name: Joseph A. Orlando Title: Vice President and Chief Financial Officer Pershing Square, L.P. By: Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member By: /S/ William Ackman Name: William Ackman

from SC 13D/A 1 page Exhibit 1 Agreement This Will Confirm the Agreement by and Among All the Undersigned That the Schedule 13d Filed on or About This Date With Respect to the Beneficial Ownership of the Undersigned of Shares of the Common Stock of Plains Resources Inc. Is Being Filed on Behalf of Each of the Entities Named Below. This Agreement May Be Executed in Two or More Counterparts, Each of Which Shall Be Deemed an Original, but All of Which Together Shall Constitute One and the Same Instrument. Dated: April 30, 2004 Leucadia National Corporation By: /S/ Joseph A. Orlando Name: Joseph A. Orlando Title: Vice President and Chief Financial Officer Pershing Square, L.P. By: Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member By: /S/ William Ackman Name: William Ackman

from SC 13D/A 1 page Exhibit 1 Agreement This Will Confirm the Agreement by and Among All the Undersigned That the Schedule 13d Filed on or About This Date With Respect to the Beneficial Ownership of the Undersigned of Shares of the Common Stock of Plains Resources Inc. Is Being Filed on Behalf of Each of the Entities Named Below. This Agreement May Be Executed in Two or More Counterparts, Each of Which Shall Be Deemed an Original, but All of Which Together Shall Constitute One and the Same Instrument. Dated: April 19, 2004 Leucadia National Corporation By: /S/ Barbara L. Lowenthal Name: Barbara L. Lowenthal Title: Vice President and Comptroller Pershing Square, L.P. By: Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member By: /S/ William Ackman Name: William Ackman

from SC 13D/A 1 page Exhibit 1 Agreement This Will Confirm the Agreement by and Among All the Undersigned That the Schedule 13d Filed on or About This Date With Respect to the Beneficial Ownership of the Undersigned of Shares of the Common Stock of Plains Resources Inc. Is Being Filed on Behalf of Each of the Entities Named Below. This Agreement May Be Executed in Two or More Counterparts, Each of Which Shall Be Deemed an Original, but All of Which Together Shall Constitute One and the Same Instrument. Dated: March 19, 2004 Leucadia National Corporation By: /S/ Joseph A. Orlando Name: Joseph A. Orlando Title: Vice President and Chief Financial Officer Pershing Square, L.P. By: Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member Pershing Square GP, LLC By: /S/ William Ackman Name: William Ackman Title: Managing Member By: /S/ William Ackman Name: William Ackman

from SC 13G/A 1 page Exhibit Schedule 13g Joint Filing Agreement the Undersigned and Each Other Person Executing This Joint Filing Agreement Agree as Follows: (I) the Undersigned and Each Other Person Executing This Joint Filing Agreement Are Individually Eligible to Use the Schedule 13g to Which This Exhibit Is Attached, and Such Schedule 13g Is Filed on Behalf of the Undersigned and Each Other Person Executing This Joint Filing Agreement; and (II) the Undersigned and Each Other Person Executing This Joint Filing Agreement Are Responsible for the Timely Filing of Such Schedule 13g and Any Amendments Thereto, and for the Completeness and Accuracy of the Information Concerning Such Person Contained Therein; but None of the Undersigned or Any Other Person Executing This Joint Filing Agreement Is Responsible for the Completeness or Accuracy of the Information Concerning Any Other Persons Making the Filing, Unless Such Person Knows or Has Reason to Believe That Such Information Is Inaccurate. This Agreement May Be Executed in One or More Counterparts by Each Person Executing This Joint Filing Agreement, and Each Such Counterparts Shall Be an Original but All of Which, Taken Together, Shall Constitute but One and the Same Instrument. Dated: February 8, 1999 Advisory Research, Inc. By: /S/ David B. Heller Name: David B. Heller Its: President /S/ David B. Heller David B. Heller Page 9 of 9 Pages

from SC 13G/A 1 page Power of Attorney Forms