Phyllis Johnson served as Manuel's secretary for four decades and became a personal friend and champion of each student that worked with him.
	Mike Myers maintained the glass vacuum system and mass spectrometer that Manuel and his students used to measure the abundance of various types of atoms in lunar, meteorite, and terrestrial samples.
	Joseph Counsil maintained the electronics for the mass spectrometer that Manuel and his students used to measure the abundance of various types of atoms in lunar, meteorite, and terrestrial samples.
	Mark Stein from the Geology Department at UC-Santa Barbara updated our aging mass spectrometer in the early 1980s by installing computer-controlled magnetic perk jumping and data acquisition. This improvement was used in measurements that confirmed the link of"normal" xenon with iron and sulfur from the central part of the solar system, and the link of "strange" xenon with primordial helium and other light elements from the outer part of the solar system. "Terrestrial-type xenon in meteoritic troilite", Nature 299 (1982) 807-810. (Link:  http://web.umr.edu/~om/Data/1972Data.htm)
	Mac McCroy maintained Professor Reynolds' mass spectrometers in the Physics Department at UC Berkeley for many years.  On reaching retirement, Professor Reynolds gave one of his mass spec tubes to Manuel.   Mac made certain all the connections were labeled before Manuel brought the tube back to Rolla, and then answered a multitude of inquiries on interfacing the tube to the electronics at UMR. That new mass spec tube was used to show that iron sulfide inclusions of the Allende carbonaceous meteorite contain "normal" xenon, like that in the Earth, Mars, and the Sun. "Terrestial-type xenon in sulfides of the Allende meteorite", Geochem. J. 30 (1996) 17.