1975
|
January
January; 19 (1):
1 - 119
|
February
February; 19 (2):
121 - 232
|
March
March; 19 (3):
233 - 354
|
April
April; 19 (4):
355 - 486
|
May
May; 19 (5):
487 - 349751
|
June
June; 19 (6):
613 - 740
|
July
July; 20 (1):
3 - 116
|
August
August; 20 (2):
117 - 238
|
September
September; 20 (3):
239 - 370
|
October
October; 20 (4):
371 - 490
|
November
November; 20 (5):
491 - 604
|
December
December; 20 (6):
605 - 735
|
