The Cirkers started the business selling
remaindered books by mail. Since the 1960s, the vast majority of Dover's titles have been paper-bound books of various sizes. Dover paperbacks had sewn pages, unlike most paperbacks, which were held together with glue and subject to page drop-out. Beginning in the 1950s, Dover also issued a series of
Listen & Learn language courses prepared primarily using teachers from
Columbia University. For a time, Dover also published a catalog of
LP phonograph records. Some, such as selected recordings of
Schubert's solo and chamber works featuring pianist
Friedrich Wührer, were reissues of earlier monaural releases from other labels. Noteworthy among Dover's original issues was an extensive series documenting pianist
Beveridge Webster in literature ranging from
Beethoven's
Hammerklavier sonata to the second piano sonata by
Roger Sessions. In keeping with its thrifty philosophy, by using lower recording levels, leading to narrower grooves, Dover was able to include more minutes than usual on each LP; however, the lower recording levels meant more
noise and more vulnerability to scratches. Dover's foray into recordings was not as successful as its core business of book republication, and the company eventually abandoned it. Starting in the 1990s, Dover has published a specialized line of low-cost reprints of public domain literature known as "
Dover Thrift Editions", which are generally priced at US$5 or less. They also have several lines of foreign language books. Hayward Cirker died in 2000 at the age of 82. In that same year, Dover Publications was acquired by Courier Corporation. Courier was acquired by
RR Donnelley in 2015. RR Donnelly split into three in 2016; Dover became part of
LSC Communications. In 2020, LSC Communications, Inc. and 21 affiliated debtors filed
Chapter 11 bankruptcy in the
United States District Court for the Southern District of New York. The company was purchased in December 2020 by the private equity holding company
Atlas Holdings. Blanche Cirker died in 2022. ==References==