Sōsai gojūnen
Subtitle: Kabushiki Kaisha Kōekisha no ayumi
By: [hensansha Hōkōsha].
Contributors: Kōekisha.; Hōkōsha.
Publisher: Kōekisha
Published: 1982
Place of publication: Ōsaka
Language: jpn
Number of pages: 563
Subjects: Kōekisha -- History.
Other titles: Sōsai 50-nen.
Notes: Bibliography: p. 509.