1970-1991. 77 bulletins; incomplete set; numbers 43-131, missing numbers 44, 48, 49, 56, 66, 96, 97, 100, 101, 103, 105, and 129; white paper covers with black cover titles; minimal wear on covers; 4to - over 9 3/4" to 12" tall; no jacket; interior clean and unmarked. Paginated separately.