Didlap, E. (1948). Die natuerliche Harmonie in der Landwirtschaft.
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Dyfyniad Arddull Chicago
Didlap, Edwin. Die Natuerliche Harmonie in Der Landwirtschaft. Innsbruck, 1948.
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Dyfyniad MLA
Didlap, Edwin. Die Natuerliche Harmonie in Der Landwirtschaft. 1948.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.