In 19th-century America the landscape oil sketch emerged as a finished work of art, worthy of exhibition and sale. This work concentrates on such leading landscape painters as Frederic Church, Albert Bierstadt, and Thomas Cole. The author offers a fresh interpretation of the smaller, more immediate oil sketch as both a marketing tool for the resulting large studio painting and an artistic genre. Featuring colour reproductions and archival photographs, the work follows great artists on their travels to sketch grand landscapes, and charts public interest in both the artists' journeys and the sketches.