COMMENT ā VALID 00002 PAGES C REC PAGE DESCRIPTION C00001 00001 C00002 00002 Dr. Dan Campbell C00003 ENDMK Cā; Dr. Dan Campbell Box 2770 Rural Route 2 Yarmouth County Nova Scotia B5A 4A6 Canada Dear Dr. Campbell: Enclosed are a recent paper and a bibliography. If I subsequently understand better the discussion in your letter, I may have a response. Sincerely,