1. A method of storing information for a paper document, the method comprising: obtaining an electronic representation of a first paper document; determining a first file descriptor based upon the electronic representation of the first paper document; determining a feature descriptor from a first database that matches the first feature descriptor, the first database storing information identifying a plurality of feature descriptors and electronic document information for each feature descriptor in the plurality of feature descriptors, wherein the electronic document information for a feature descriptor comprises information identifying an electronic document; determining, from the first database, electronic document information associated with the matching feature descriptor; and storing an identification code associated with an identification tag and the electronic document information associated with the matching feature descriptor in a second database such that the electronic document information associated with the matching feature descriptor is associated with the identification code.