Lever, John.
Crocodile industry training manual photography & layout, Greg Mitchell. produced by John Lever ; - Port Moresby : Wildlife Branch, D.A.S.F., 1975. - 35 p. : ill. - Wildlife manual ; no. 75/1 .
Crocodile farming--Papua New Guinea.
Crocodile industry training manual photography & layout, Greg Mitchell. produced by John Lever ; - Port Moresby : Wildlife Branch, D.A.S.F., 1975. - 35 p. : ill. - Wildlife manual ; no. 75/1 .
Crocodile farming--Papua New Guinea.