I found this beautiful tribute to WHB published by The National Cyclopedia of American Biography.  Below the picture is the first page.  There are 8 pages altogether giving a biography beginning with his birth in Waterbury, Conn July 5, 1859 and ending with his death "Mr. Bristol died, without issue, in New Haven, Connecticut, June 18, 1930."  There is no date of publication that I can find but I would imagine it was published somewhere around 1930.