Found in 4 Collections and/or Records:
Early drafts of the Principia and related notes; additions, corrections and revisions to the Principia. This is the 'general' category: papers relating specifically to lunar theory or containing mathematical problems are classified separately.
Papers regarding the verification of Einstein's theory of gravitation from observations of total eclipses, notably that of 30 August 1905 and that witnessed at Cordillo Downs, South Australia, on 20-21 September 1922.
Offprint from the Monthly Notices of the Royal Astronomical Society, Geophysical Supplement, Volume 4, Number 3.