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Beginners' Zoology . Fig. 306.—Position of LungsAND Air Sacs (Pigeon). Tr, windpipe; P, lungs; Lm, sacunder clavicle with prolongation(Ui) into humerus; La, sacs inabdomen. BIRDS i6s. Fig. 307. — Position of
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Beginners' Zoology . Fig. 306.—Position of LungsAND Air Sacs (Pigeon). Tr, windpipe; P, lungs; Lm, sacunder clavicle with prolongation(Ui) into humerus; La, sacs inabdomen. BIRDS i6s. Fig. 307. — Position of
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