Earthworms, their intensive propagation and use in biological soil-building the Earthmaster system Biological soil- building Soil-building Earthmaster system Barrett, Thomas Jason 1884- creator text xx Roscoe, Calif Earthmaster Publications c1948 1948 [5th rev. ed.] monographic eng
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59 p. illus., port. 23 cm. "An introduction to the more complete textbook, H̀“arnessing the earthworm."̀“-p. 54. Pub. 1942 under title: The Earthmaster system for intensive propagation and use of domesticated earthworms. Earthworm culture Soils SB998.E4 B35 1948 631.45 agr48000512 U. S. Dept. of Agr. Libr. 770520 20260227111010.0 agr48000512