This is a set of 6 paperback booklets from the Phillip's 66 Petroleum Company about grasses,legumes and forbs.The first two are Native Grasses Legumes and Forbs,the third is Undesirable Grasses and Forbs,the fourth is Poisonous Grassland Plants,the fifth and sixth are Introduced Grasses and Legumes.The booklets vary in size from 26 to 45 pages.They have copyright dates ranging from 1955 to 1960 but I don't know exactly when they were published.The booklets show various wear from age and handling but are still in good shape for their age.The first booklet has a couple surface rips on the cover from some tape being removed.The rest are in decent shape.

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