Made available in DSpace on 2015-04-22T02:49:52Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) B19-622.pdf: 41158273 bytes, checksum: fc13a0c80d1650b52a4994443fd43b1d (MD5) Previous issue date: 1973-09