The Houghton Mifflin Company Trade Book Archival Collection is comprised of Trade Division materials that were originally kept in the Park Street building, which the company occupied from 1880 to 1994, before being donated to the Boston Public Library. The company’s editors used this collection as their working library. The collection includes adult and juvenile titles as well as reference materials, audio, and kits from Houghton Mifflin, Clarion, and other Houghton Mifflin Harcourt imprints.
Henry McCarter did not seem to sign his book covers that often, but he used a stylized HM monogram on some of his designs, as well as used a basic signature of his full name spelled out.
"HENRY LANDON PARKHURST, an artist and instructor in architecture in the Pratt Institute, died in the Peck Memorial Hospital on Monday. Mr. Parkhurst was born in Oswego, N. Y., fifty-four years ago and studied at the Academy of Fine Arts in this city. He had also been instructor in architecture at Cooper Union and in the New York School of Applied Design for Women. He was a member of the New York Sketch Club." - Parkhurst's Obituary in the New York Times, February 3, 1921.
Helen Sinclair Patterson was a commercial artist in Boston. She married fellow artist, Herbert Deland Williams in 1907 and thereafter signed her work as Helen Patterson Williams.
"Helen Hay was a highly skilled arts-and-crafts practitioner whose designs played an important role in creating The Evergreen: A Northern Seasonal (1895-96/7) and realizing its socio-political mission of revitalizing Edinburgh Old Town specifically, and Scottish culture more broadly, through the renewal of Celtic ornament and its applications (See General Introduction to The Evergreen). Despite her significant artistic contributions to the architecture of The Evergreen’s printed page and Edinburgh’s built environment, however, Helen Hay remains a largely unknown Scottish designer." - Biography by Kooistra on the Yellow 90s website.