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The following items are revisions to NTIS General Catalog No. 4. General Catalog #5 is scheduled for publication in the spring of 1977. In the meantime, revisions to catalog #4 like this one, will be published when enough changes have occurred. The revision pages are slightly smaller than the General Catalog pages so that they may be easily inserted into the catalog.
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index