共 90 条
[81]
VOORHOEVE AG, 1965, LIBERIA HIGH FOREST
[82]
Western D., 1989, Pachyderm, V12, P42
[83]
WIJNSTEKERS W, 1992, EVOLUTION CITES REFE
[84]
Williams, 1950, ELEPHANT BILL
[85]
WILLIAMS G, 1994, AFRICA S SAHARA 1995, P3
[86]
World Resources Institute, 1992, WORLD RES 1992 93
[87]
1989, SWARA, V12, P8
[88]
[No title captured]
[89]
1994, AFRICAN ELEPHANT CON, P77
[90]
1995, PACHYDERM, V19, P64