This Civilization expansion was offered by mail order directly from Avalon Hill to General subscribers (volume 19 #4) and in the company games/parts catalog. Seven new commodities were introduced to add to the trade card piles of the base game. There were no calamities included in this expansion. The commodities introduced were carried over into the new trade deck used in Advanced Civilization but the number of cards of each of the commodities were changed. - BoardGameGeek