I'm sure that NASA has all the blueprints filed away somewhere, but the reason we don't have a Saturn V factory running today is not because NASA forgot how to make them. Instead, it's because of cost. Between the Apollo 13 disaster, the Vietnam War, and maybe some other factors, public interest and approval of continued Moon exploration wanted, and Congress revoked the planned funding for Apollo 18 through 20, opting instead to focus on programs like the Space Shuttle.
Interestingly enough, the leftover Saturn V hardware was put to good use by launching Skylab missions and the Apollo-Soyuz Test Project, both of which turned out to be valuable steps in the US space program. So as much as it pains me to say, it may have been a good thing that the last three moon missions were canceled.
Interestingly enough, the leftover Saturn V hardware was put to good use by launching Skylab missions and the Apollo-Soyuz Test Project, both of which turned out to be valuable steps in the US space program. So as much as it pains me to say, it may have been a good thing that the last three moon missions were canceled.