1535909
9781580083140
Thomas Leo Ogren has a master's degree in agricultural science and is the creator of the Ogren Plant Allergy Scale (OPALS), the first plant-allergy ranking system, now used by the United States Department of Agriculture. He is a former landscape gardening instructor, nursery owner, gardening radio show hostOgren, Thomas Leo is the author of 'Safe Sex in the Garden And Other Propositions for an Allergy-Free World' with ISBN 9781580083140 and ISBN 1580083145.
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