This hardcover book from Marion T. Hartung is a first edition published in 1971 and is an excellent resource for collectors of opalescent pattern glass. The book contains valuable information on various aspects such as industry, publication year, format, language, object type, and original/licensed reprint. The book is a price guide and is a must-have for anyone interested in collecting opalescent glassware. It was published in the United States and is in English.