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The world's most comprehensive, well documented, and well illustrated book on this subject. With extensive subject and geographic index. 221 photographs and illustrations - mostly color. Free of charge in digital PDF format.
The world's most comprehensive, well documented, and well illustrated book on this subject. With extensive subject and geographic index. 325 photographs and illustrations - many color. Free of charge in digital PDF format.
The world's most comprehensive, well documented and well illustrated book on this subject. With extensive subject and geographic index. 152 photographs and illustrations - mostly color, Free of charge in digital format on Google Books.
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The world's most comprehensive, well documented, and well illustrated book on this subject. With extensive subject and geographic index. 162 photographs and illustrations - including many early seed catalog covers. Free of charge in digital PDF format.