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Happy Holidays Special! This authoritative book on shortwave propagation is now offered in a convenient CD format. Make it your source for easy-to-understand information on sunspot activity, propagation predictions, unusual propagation effects and do-it-yourself forecasting tips. No active ham can afford to be without this book! This title is also available in its original 8.5 X 11 paperback format! Buy both the 8.5 X 11 paperback and CD and save! See Shortwave Propagation Combo.