The 'Gale crater' search of NASA doc's gives a count of 18, but I see your reference to the NTRS reduction in the total for that section of the library.
Another White House adjustment with less technical information.
California follows, but UC and others will be excepted.
Will the tech information ever be relisted? Copies apparently are present for much of the missing or removed totals. The 'cloud' search keyword process is useful for indexed materials.