U.S. exports.

1970 Jul-Sep; 1970 Apr-Jun; 1970 Jan-Mar; 1970 Oct-Dec; 1971JAN-FEB 1971; 1971:Dec.; 1971:Nov.; 1971:Oct.; 1971:Sep.; 1971:Aug.; 1971:July; 1971:June; 1971:May; 1971:Apr.; 1971:Mar.; 1971:Feb.; 1971:Jan.; 1971 Oct-Dec; 1971 Jan-Mar; no.1-3 Jan.-Mar. 1971; no.4 Apr. 1971; no.5 May 1971; no.6-9 June-Sept. 1971; no.10-12 Oct.-Dec. 1971; 1972:Dec.; 1972:Nov.; 1972:Oct.; 1972:Sep.; 1972:Aug.; 1972:July; 1972:June; 1972:May; 1972:Apr.; 1972:Mar.; 1972:Feb.; 1972:Jan.; 1972 Oct-Dec; 1972 Apr-Jun; 1972 Jan-Mar; no.1-3 Jan.-Mar. 1972; no.4-6 Apr.-June 1972; no.7-9 July-Sept. 1972; no.10-12 Oct.-Dec. 1972; 1973NOV-DEC 1973; 1973SEPT-OCT 1973; 1973JULY-AUG 1973; 1973MAY-JUNE 1973; 1973MAR-APR 1973; 1973JAN-FEB 1973; 1973:Dec.; 1973:Nov.; 1973:Oct.; 1973:Sep.; 1973:Aug.; 1973:July; 1973:June; 1973:May; 1973:Apr.; 1973:Mar.; 1973:Feb.; 1973:Jan.; no.1-3 Jan.-Mar. 1973; no.4-6 Apr.-June 1973; no.7 July 1973; no.8 Aug. 1973; no.9 Sept. 1973; no.10 Oct. 1973; no.12 Dec. 1973; no.11 Nov. 1973; 3.164:410/971-1; 3.164:410/971-2; 3.164:410/971-3; 3.164:410/971-4; 3.164:410/971-6; 3.164:410/971-7; 3.164:410/971-8; 3.164:410/971-10; 3.164:410/971-11; 3.164:410/971-12; 3.164:410/972-1; 3.164:410/972-2; 3.164:410/972-3; 3.164:410/972-4; 3.164:410/972-5; 3.164:410/972-6; 3.164:410/972-7; 3.164:410/972-8; 3.164:410/972-9; 3.164:410/972-10; 3.164:410/972-11; 3.164:410/972-12; 3.164:410/973-1; 3.164:410/973-2; 3.164:410/973-3; 3.164:410/973-4; 3.164:410/973-5; 3.164:410/973-6; 3.164:410/973-7; 3.164:410/973-8; 3.164:410/973-9; 3.164:410/973-10; 3.164:410/973-11; 3.164:410/973-12