Rusk Crackers, &Baker's Ammonia

HOPSTER QUESTION: 2 questions:{1} What could I use in place of Rusk Crackers in a piecrust? as I can't find Holland Rusk. I have a recipe for a custard Rusk pie thats really good,, do they still make them? #2 what is a replacement for baking ammonia? I have a very old recipe for Drop cookies that calls for 3lbs flour 1/2 oz. baking soda, and 1/2 oz. baking ammonia,ect, also what would 1/2 oz. equal in teaspoons? Thank You

ROSE REPLY: can't help with the rusk crackers as i don't remember what they are. maybe someone else on the blog can. for the baker's ammonia: i used it to make melting moment cookies and got it from sweet celebrations. not sure if there is a replacement for it but i believe it predated modern day baking powder. if they still carry it, 1/2 ounce would be about 2-1/2 teaspoons.