Mr. Macdonald's clients were the leading publishers and antiquarian booksellers of the late 19th and early 20th centuries .They included Scribners, The Gotham Book Mart and Brentanos
His collector clients included J.P.Morgan, Paul Mellon and Henty C. Taylor . Because these were active clients he had on hand leather bookplates in various sizes and colors for insertion in their books. I currently have duplicate examples of some of these plates, for possible exchange
J.P.Morgan used two sizes of leather bookplates in a wide range of colors.
The two brown bookplates shown on the right
are uncut examples before trimming.
The AHA plate was used by Arthur Amory Houghton Jr
I accumulate links which may interest book and bookplate collectors,
Here are three of them.
Flickr has an interactive site with all sorts of bookish ephemera
This blog from Germany is well illustrated and informative...http://ilibrariana.wordpress.com/2012/03/12/ex-libris-1-bibliotheken/
The Stanford University Bookplate Exhibit