Show 36 Usually for mounted prints an upright is necessary of legal size which be bought new or secondhand may Shelves and boxes quite satisfactory types of materials A may be used for more comber-so- me conveniently located work table will be great value in the handling and filing of found of filing cabinet or made is mounted materials All material should be classified and cataloged or indexed in I I order to make it easily accessible should be named Every picture several pictures are usually used together it may be advisable to file these as a set in an envelope folder or other jacket In Where ieach set be red A responds to the number or letter a list that file - cor- - Both major If several teachers or groups which lists lindividual 22 Maintenance of recorders 21McKown Instruction Recorders have to be cleaned at and mechanical operations checked certain intervals Harry New C York and Roberts McGraw-H- ill Alvin B Audio-Visu- al 1949 Book Go to see that the Second Aids To Edition 147 McKown Harry C New York: Instruction p of the item in the system cross-indexi- ng card or num- as well as complete sets under several heads will be necessary P on a classifications are desirable use the material items a cataloging system is composed of two main parts or lettered descriptive statement and minor in a good idea not to include more than twenty or so it is such cases 147 and Roberts McGraw-H- ill Alvin Book Co B Audio-Visu- al 1949 Second Aids Edition to |