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41.
Bulletin (Number 154, April 15-30, 1950)
42.
Bulletin (Number 155, May 1-15, 1950)
43.
Bulletin (Number 156, May 15-31, 1950)
44.
Bulletin (Number 139, September 1-15, 1949)
45.
Bulletin (Number 157, June 1-15, 1950)
46.
Bulletin (Number 158, June 15-30, 1950)
47.
Bulletin (Number 159, July 1-15, 1950)
48.
Bulletin (Number 160, July 15-30, 1950)
49.
Bulletin (Number 161, August 1-15, 1950)
50.
Bulletin (Number 162, August 15-31, 1950)
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