KLUYVER HN (1963) Literatuur: J.R. Hebditch. Binoculars and telescopes for field work. LIMOSA 36 (1): 127-127.

1. R. HEBDITCH: Binoculars and telescopes for field work. - 20 pp. Prijs 1Yz s. E. COHEN: Nestboxes. - 41 pp.

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