Preventive conservation

Microfilm,          If a source of information, such as a book or a paper document, cannot be maintained in its

Phonograph Records,           Sound recordings or phonograph records preserve information through music and recorded voice and allow such material to

Photographs,         Photographs record and store information regarding events, history, and people and provide through study a basis for the

Introduction:       Information has been recorded throughout time in wide a variety of formats as human knowledge, ability and skills