| Notes: | Concept with a blue cover ("Blue Concept") published as a special edition of the general "red" Concept beginning in Sept. 1962 "especially and only for the members of the regional Working Groups for the study on 'The Missionary Structure of the Congregation' and those otherwise involved in the study ... ". Red Concept continued to be published until Dec. 1966. From special issue 23 (July 1969), Concept numbered in sequence and published with red, blue, or green covers, depending on each issue's subject-matter.
Concept with blue cover also called Documents 1-3 (Sept. 1962-Mar. 1963) and Special issues 4-12 (July 1963-Dec. 1966). All issues from May 1967-Oct. 1970 called Special issue.
In English; some issues have some or all content in German, French or Italian.
German edition also issued, beginning with no. 1, 1963.
committed to retain from JKM Seminaries Library 2023 JKM University of Chicago Library
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