00479nam a2200181Ia 4500003000900000008004100009020001800050040001600068080001500084100001600099245005000115260003000165300001000195650004100205650001600246650002400262650001100286IN-BaIIA211028s9999    xx            000 0 eng d  a0-8448-0359-6  cIIA Library  a535.8bHOR  aHorne, D. F 0aDividing, ruling and mask-makingcD. F. Horne  aLondonbAdam Hilgerc1974  a315p.  aAstronomy and astrophysics thesaurus  aMask-Making  aOptical instruments  aOptics