00602nam 2200181z- 450 9910557191903321(CKB)5400000000040254(EXLCZ)99540000000004025420220406c2020uuuu -u- -engSimplified Signs : A Manual Sign-Communication System for Special Populations, Volume 1Open Book Publishers1-78374-927-X Simplified Signs BOOK9910557191903321Simplified Signs : A Manual Sign-Communication System for Special Populations, Volume 12825642UNINA