There are many variations in how octavos were produced. Generally, quartos have more squarish proportions than folios or octavos. Included are several hundred choral octavos printed singly (S), or in collections (C). His Greek octavos were double the price at 60 soldi. Hustad's catalog includes over 100 octavos and many vocal and keyboard volumes. Nine performance editions of his choral octavos, edited by Green, were published by Laurendale. In 1971, chorus/piano octavos were published by Lawson-Gould. Manutius's priced his Latin octavos at 30 soldi, which was a fourth of a ducat. Numerous other octavos survive beginning from about 1461. Octavos, though nominally cheaper to produce, were somewhat different.