Discusses codes, silent signals, invisible writing, and other ways to conceal messages.
"synopsis" may belong to another edition of this title.
Book Description New York: Holt, Rinehart & Winston, 1980. Hardcover. Book Condition: Good. Hardcover: illustrated boards, no dustjacket. 96 pp., illus. Library discard, with pocket, call no., &c. Covers rubbed, inside clean & unmarked. Uncommon in hardcover. Bookseller Inventory # 30002
Book Description New York: Holt, Rinehart & Winston, 1980. Hardcover. Book Condition: Good. No Jacket. 1st Edition. 1st printing. Good HC, no DJ. Ex-library. Pictorial boards. Scuffed, scraped covers; tightly bound; few small library stamps in prelims, no other library marks; bright, clean interior. 12mo, 95 pp; index; illustrated. Bookseller Inventory # A03761
Book Description Henry Holt & Co, 1980. Book Condition: GOOD. book was well loved but cared for. Possible ex-library copy with all the usual markings and stickers. Some light textual notes, highlighting and underling. Bookseller Inventory # 2785413902