This document was referenced in a report bibliography obtained from the Defense Technical Information Center (DTIC). The record was requested, and the below is what was received. According to the Department of Justice:
FOIA Exemption (b)(4) protects “trade secrets and commercial or financial information obtained from a person [that is]privileged or confidential.” (1) This exemption is intended to protect the interests of both the government and submitters of information. Its very existence encourages submitters to voluntarily furnish useful commercial or financial information to the government and it correspondingly provides the government with an assurance that such information will be reliable. The exemption also affords protection to those submitters who are required to furnish commercial or financial information to the government by safeguarding them from the competitive disadvantages that could result from disclosure. (2) The exemption covers two broad categories of information in federal agency records: (1) trade secrets; and (2) information that is (a) commercial or financial, and (b) obtained from a person, and (c) privileged or confidential.
Propulsion Systems For Launch Vehicles And Spacecraft, 1977 [30 Pages, 1MB]