Ingram Publisher Services has added three new publishers to its list of clients. Ingram is now handling distribution of titles in the U.S. and Canada for Actar Publishers, a publisher specializing in architecture design books. Ingram is also now managing distribution and sales in the U.S. for Plough Publishing House, an independent publisher of books and the Plough Quarterly magazine. Ingram has also added publishing house and interactive platform Publishing, handling U.S. and Canadian distribution. Publishing also utilizes print-on-demand services from Lightning Source, and both Plough and are serviced by CoreSource for e-book distribution.