Entognatha. Part Introduction -- Order Collembola: The springtails -- Order Diplura: The Two-Tailed or Two-Pronged Bristletails -- Order Protura: The Proturans -- Insecta-'Apterygota'. Part ...
Description based on: Vol. 1, pt. 2, published in May 1954; title from cover. Some volumes are issued as 2nd- editions. ENT v.1:pt. 17, v. 2:pt. 7, v.4:pt. 5b, pt. 5 ...
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