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This undated Project Blue Book microfilm case document from the U.S. Air Force, released through the Internet Archive, covers files 1377 and 1415 dated July 7, 1952. It records CPO Delbert C. Newhouse's two photos of a group of objects milling about in rough formation, taken 7 miles north of Tremonton, Utah, at 1110 MST on 2 July 1952 after his wife noticed them. The record notes there were no reference points and that the images showed no detail. It gives the explanation as pillow balloons or birds.
Files 1377 & 1415 July 7, 1952 Tremonton, Utah 2 photos
Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 3 pages are in the text index: search them above, or from the library's search.