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Considering 1 drop contains 100 mcg's implies that 3 drops is triple acid so a 300 mcg containing blotter.
You're lucky if you can get blotters of that strength. I have them with 200 mcg on it, but that's already rare here in Europe. It are Albert Hofmann blotters of his 100th birthday.
In the 60's, the average and prefered dose was about 300 mcg's and each unit contained somewhere around this range. Nowadays the strength is just poor compared to the flower power period.