Someone has posted up a PDF copy of Philip J. Corso's book "The
Day After Roswell".
I bought this book a number of years ago, and highly recommend it.
Corso was given the job of trying to understand artifacts collected
from the wreckage of the downed Roswell UFO, and overseeing how much
reverse-engineering could be done (for the US Military ... of
Interesting Sidenote: The Roswell crash occurred in 1947. The
Transistor was 'invented' in 1948. Hmmmmm .....