FLAG SEMAPHORE
two flags, eight positions 45 degrees apart — all 26 letters; after the numerals sign A–I read as 1–9 and K as 0
US$1.50
MARITIME SIGNAL FLAGS
the twenty-six alphabet flags of the International Code of Signals — and what each one means alone
US$1.50
NUMERAL PENNANTS AND SUBSTITUTES
how to fly the same flag twice in one group with only one set aboard
US$1.50