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7by Iowa Ornithologists' Union; Fuller, James L.Contributors: “...Thelen, Ed...”
Published 1988
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8by Harr, Douglas C.Contributors: “...Thelen, Ed; Schoenewe, Lee A....”
Published 1998
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9by Schoenewe, Lee A.Contributors: “...Thelen, Ed; Iowa Ornithologists' Union Records Committee...”
Published 1996
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10by Padelford, Babs; Padelford, LorenContributors: “...Kent, Thomas H. (Thomas Hugh), 1934-; Silcock, W. Ross; Thelen, Ed; Ernzen, Peter; Poggensee, Don...”
Published 1994
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