keeping in mind that we're not supposed to have identification threads, i.e. we can't possibly tell you what you took, there's still some possible value of general information here--
if the thing is unperforated, well, one can probably get another 19 doses or whatever out of a sheet by making them slightly smaller; if it's perforated, then size is pretty standardized. so who knows? it's one of the less important factors, really, but worth remarking on, especially if what's circulating is starting to change from what things used to be (time was, you could take a crisp [U.S.] bill, fold it according to certain landmarks, and use it a guide to rip more or less perfectly sized sheets off of larger 'sheets' of LSD infused paper)