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Reviewing the Colle-Koltanowski system | ChessBase
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Colle System by George Koltanowski (1903-2000) signed - Paperback - Signed - 1984 - from The Book Collector ABAA, ILAB, TBA (SKU: BSC0650)
COLLE SYSTEM By George Koltanowski 11TH EDITION - 1984 Very Good Opening Book 9780931462351 | eBay
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