Untersuchungen über höhere Arithmetik - Carl Friedrich Gauss - Google Books

http://books.google.de/books?id=0Scif3YsQHMC&pg=PA422

In this volume are included all of Gauss's number-theoretic works: his masterpiece, Disquisitiones Arithmeticae, published when Gauss was only 25 years old; several papers published during the ensuing 31 years; and papers taken from material found in…