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 |  |  | Blackstone's PCSO Handbook by David Morgan (Contributor), Robert Underwood (Contributor), Robin Bryant (Contributor), Barry Spruce (Contributor), Bryn Caless (Editor) Paperback, 200 Pages, Published 2007 by OUP Oxford
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 |  |  | Spray characterization trials for the 1979 Maine spruce budworm control program (Report) by John Willard Barry Unknown Binding, Published 1980 by Methods Application Group, Forest Insect and Disease Management, Forest Service, USDA
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 |  |  | Preliminary data report: Davis aircraft spray characteristics trials by John W Barry Unknown Binding, 65 Pages, Published 1988 by USDA Forest Service, Forest Pest Management
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