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THE DOOMSDAY DROP is an adventure module for the Top Secret/S.I. roleplaying game system that can be played by itself, used along with OPERATION: STARFIRE as part of a larger campaign, or used as an adventuring research source with its detailed look at the inner-workings of a modern-day nuclear attack submarine.
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Book Description TSR Hobbies, 1988. Paperback. Condition: New. Never used!. Seller Inventory # P110880384808
Book Description TSR Hobbies, 1988. Hardcover. Condition: New. New condition, still in the original publisher's shrink wrap.; Top Secret/S.I. Module TS2; 10.60 X 8.40 X 0.60 inches. Seller Inventory # 26060
Book Description TSR Hobbies, 1988. Condition: New. book. Seller Inventory # M0880384808
Book Description TSR Hobbies. PAPERBACK. Condition: New. 0880384808 Please allow 4 - 14 business days for Standard shipping, within the US. Seller Inventory # XM-0880384808