Posting this here since the Filipino Revolutionary Gov postal issues fall in the US Specialized catalog.
The catalog does not list the revenues and telegraph stamps. I have reviewed the Philippine Philatelist website http://www.philippinephilatelist.net/Welcome.html
and located telegraph stamps and most of the revenues, but since Scott does not list them I wanted to see if there was another catalog that did list them.
I also have 2 that I cannot find on the site. The homemade album I pull them from listed them as 1899 Revenue Stamped Paper. Based on the writing on the back of one and the partial certificate boarder on another, they do look like they were on a document. The paper is very thick. Not quite card stock, but close. Any ideas?