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This name was changed to Project Grudge on February 12, 1949, and again to Project Blue Book on March 25, 1952. The first named investigation was Project Sign, which was formally initiated on January 26, 1948. #If hli jlk by the sss similarity codeLess formally, the name is used to connote the Air Force’s entire period of investigations, which began inside the Air Materiel Command at Wright-Patterson AFB without a specific code name on June 30, 1947. Strictly speaking, this name applies only to the time period beginning in March 1952 and ending with the close of investigations in January 1970. About Project Blue Book Project Blue Book was the code name of the U.S. #If hli jlk by the sss similarity freenot available, additional data for a free propeller of similar geometry- are presented. In addition, several rolls of microfilm created during the operation of Project Sign are also included in the Archive. performance of geometrically similar machines of arbitrary size. #If hli jlk by the sss similarity archiveThe primary source of Archive documents are microfilm rolls made available to the public by the National Archives (NARA) including a set of uncensored rolls first discovered at NARA in 1998. These administrative files include correspondence, formal reports, status reports, AFOSI investigative reports, and various public statements and briefing materials. In addition to individual UFO reports the Archive includes administrative files that provide insight into Project Blue Book operations. ![]() About the Project Blue Book Archive The Project Blue Book Archive contains tens of thousands of documents generated by United States Air Force investigations from the early AMC period through to the end of Project Blue Book. Please make checks payable to Blue Book Archive and send them to: Blue Book Archive PO Box 9732 Norfolk, VA 23505 Please note that donations made to the Blue Book Archive are NOT tax deductible. ![]() To make a donation using a credit card or PayPal please use our secure online form available at: You may also send a check or money order to the address listed below. government's investigation of the UFO phenomenon. Your generous support will help us to achieve our goal of providing free access to hundreds of thousands of official documents related to the U.S. #If hli jlk by the sss similarity pdfThe extreme simplicity of the equipment required makes this technique available to essentially every surface science laboratory.This PDF format document was produced by The Project Blue Book Archive with the support of Project 1947, Sign Historical Group, Fund for UFO Research, and the Archives for UFO Research, News and Information Service If you have found this PDF format document useful please consider making a donation in support of our efforts. ![]() The principal limitation in these measurements results from diffraction of the incident electron beam, which produces variations in electron reflectivity. Extended fine structure above the threshold can be inverted to obtain interatomic spacings even from relatively disordered surfaces. Near-threshold structure is related to the electronic state of the atoms. The spectrum of core excitation thresholds provides information on the composition of the surface region. If the corresponding side lengths of the two triangles. Although the existence of these inflections was discounted by later researchers, recent studies of the derivative of the yield leave no doubt as to their reality or their origin. If an angle of one triangle is congruent to an angle of a second triangle and the lengths of the sides including these angles are proportions, then the triangles are similar. Small inflections in plots of the total yield of secondary electrons versus primary electron energy were reported more than fifty years ago and attributed variously to thresholds for the excitation of core states, and to diffraction of the incident electrons. ![]()
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