As used in this Article, the word "record" or "records" shall mean any document, book, paper, photograph,
map, sound recording or other material, regardless of physical form
or characteristics, made or received pursuant to law or in connection
with the transaction of official business. Library and museum material
made or acquired and preserved solely for reference or exhibition
purposes, extra copies of documents preserved only for convenience
of reference, and stocks of publications and of processed documents
are not included within the definition of records as used in this
Article, and are hereinafter designated as "non-record" materials.