**Mary Kathryn Burton** (12 July 1925 - 4 March 2012). Appears to have traded under the name of [[M. K. Burton Books]] as a mail-order concern using a Box 447 address in Ann Arbor from ca. 1963-1966. She was a member of the A.B.A.A. 

See Sheppard's //[[https://books.google.com/books?id=6xrPAAAAMAAJ&q=%22m.+k.+burton%22+box+447&dq=%22m.+k.+burton%22+box+447&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwjE9oWt8qzrAhU1Pn0KHa2YAfYQ6wEwA3oECAMQAQ|Book Dealers in North America]]// (1963-1965) and the //[[https://books.google.com/books?id=_hAbAAAAMAAJ&q=%22m.+k.+burton%22+box+447+ann+arbor&dq=%22m.+k.+burton%22+box+447+ann+arbor&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwjQ2tTX9qzrAhWR_J4KHd_FDDQQ6AEwBHoECAYQAg|AB Bookman's Yearbook]]// for 1966.

Public records note [[https://search.ancestry.com/cgi-bin/sse.dll?indiv=1&dbid=9093&h=4335791&tid=&pid=&queryId=4ce67dd8ce9216a971440d12ef27f128&usePUB=true&_phsrc=OAm477&_phstart=successSource|the marriage]] of Mary Kathryn Rutten to Robert Edward Burton on 30 July 1949 in Detroit. 

[[R. E. Burton]] (noted as a co-owner of M. K. Burton in the 1965 Bowker //American Book Trade Directory//) [[https://books.google.com/books?id=YvknAAAAMAAJ&newbks=1&newbks_redir=0&lpg=RA33-PA5&dq=%22robert%20e.%20burton%22%20michigan%20record&pg=RA33-PA5#v=onepage&q=%22robert%20e.%20burton%22&f=false|had been hired]] by the University of Michigan as the director of its Science and Engineering libraries in 1962.