一般注記"Conducted under a cooperative agreement between Purdue University and ... Economic Research Service"--P. iii
Distributed to depository libraries in microfiche
"December 1990"--P. iii
Physical description for original version: v, 26 p. : 28 cm
書誌注記Includes bibliographical references (p. 22)
原資料等に関する注記原資料の出版事項: [Washington, DC] ; Rockville, MD : U.S. Dept. of Agriculture, Economic Research Service, Resources and Technology Division : ERS-NASS [distributor, 1990]
SUPTDOC番号: A 93.44: AGES 90-66
GPO管理番号: 42-W-1 (MF)