Aug. 15, 1976
7
July 28, 1974
320
Sept. 7, 1972
4
April 29, 1972
1
March 25, 1972
3
March 24, 1972
1
March 23, 1972
2
March 22, 1972
1
Feb. 10, 1972
1
Feb. 9, 1972
4
Peer-reviewed scientific article
1969 B.L. Penzhorn & A.K. Morris
Peer-reviewed scientific article
1976 B.L. Penzhorn & P. F. Van Straaten
Peer-reviewed scientific article
1974 B.L. Penzhorn & M.C. Olivier
Peer-reviewed scientific article
1970 B.L. Penzhorn