Blacklock, Dr.2009-07-282009-07-282009-07-28http://hdl.handle.net/10222/12086One letter , three pages.One letter to James Dinwiddie from Dr Blacklock dated Sept 17, 1787.enCelestialMagazineOpticalMachineTelescopeCouncilRobisonDr. BlacklockJames Dinwiddie1787DiseaseLondonMetropolisDiscoveryMagistratesText