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| Alphabetical [« »] cenyth 17 cercle 41 cercles 5 certein 4 certeinly 1 certeyn 4 certeyne 1 | Frequency [« »] 4 azymutz 4 celestial 4 celestiall 4 certein 4 certeyn 4 cesar 4 clepe | Geoffrey Chaucer A Treatise on the Astrolabe IntraText - Concordances certein |
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1 [Title]| I purpose to teche the a certein nombre of conclusions aperteynyng 2 [Title]| same instrument. I seie a certein of conclusions, for thre 3 13 | square plate perced with certein holes, somme more and somme 4 21 | thiself liketh, contenith certein nombre of sterres fixes,