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Full-text available from the year 1916 to current.
- Volume 18, Number 1, Pages 1 - 32
- Volume 18, Number 2, Pages 33 - 80
- Volume 18, Number 3, Pages 81 - 132
- Volume 18, Number 4, Pages 133 - 180
- Volume 18, Number 5, Pages 181 - 224
- Volume 18, Number 6, Pages 225 - 276
- Volume 18, Number 7, Pages 277 - 324
- Volume 18, Number 8, Pages 325 - 368
- Volume 18, Number 9, Pages 369 - 420
- Volume 18, Number 10, Pages 421 - 468
- Volume 18, Number 11, Pages 469 - 512
- Volume 18, Number 12, Pages 513 - 552