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Dyfyniad Arddull ChicagoPatel, k. Farm-structure and Resource-use in Draught-prone Area Vol II. NULL: N.I.B mgt, 1978.
Dyfyniad MLAPatel, k. Farm-structure and Resource-use in Draught-prone Area Vol II. N.I.B mgt, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.