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The Ottawa photographic zenith telescope; and Method and formulae used in P.Z.T. plate measurement; and A program machine for
automatic operation of the Ottawa P.Z.T.
; Thomson, M M; Tanner, R W; Hollinsworth, V E. Publications of the Dominion
Observatory, Ottawa vol. 15, no. 4, 1955, 40 pages, https://doi.org/10.4095/314491