Het Spectrum is a Dutch publishing house which publishes books under its own name as well as through the imprints Winkler Prins and Prisma. The company was established in 1935 by book sellers P. H. Bogaard and A. H. Bloemsma and from humble beginnings in a room above a bakery in de Biltstraat in Utrecht has grown into one of the largest publishers in the Netherlands.
Het Spectrum started as a progressive-Catholic publisher that aspired to supply good reading materials to the masses. Hence it published many pocket books. After World War II, this formula continued as Prisma Pockets. Among the pocket books were translated classics for the modest price of 1,25 guilder. The Prisma dictionaries were also part of this line.
