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Baker's ammonia was used as a leavening agent similar to baking soda and baking powder. I did find a source online for it. If you paste this address into your browser, http://www.kingarthurflour.com/shop/items/bakers-ammonia-ammonium-carbonate-27-oz?utm_source=frooglecom&utm_medium=cse&utm_campaign=shopping&gclid=COu7yKKziLQCFcxAMgod6h0AvA , you should go right to the product. You can also substitute it with baking powder and baking soda. Substitute as follows: 1 teaspoon Baker's Ammonia = 1 teaspoon Baking Powder plus 1 teaspoon Baking Soda. This should produce a very similar product but it may not be as light or have as crisp a texture. Good luck with the recipe!