About 12 years ago, I had the occasion to visit the office of the Catholic Truth Society in London during a speaking tour there. A number of their venerable apologetics tracts and booklets were on display in a bookcase, most of them having been written decades earlier (some, many decades earlier) during a time in England when vigorous Catholic apologetics outreach to Protestants, atheists, and other non-Catholics was quite common.
The CTS staffer I spoke to that day made sure to provide me with a stack of pamphlets before I left, and in the ensuing years since that visit, I have lost track of them. That is, until today, when I discovered a whole cache of them posted on a Catholic website — each of them scanned in and available for free as PDFs of the originals. I've downloaded them all and would like to encourage you to go and do likewise. As basic, Catholic explanations of doctrinal, moral, and social issues go, these CTS materials are accessible, interesting, fact-filled, and compelling. As the old Alka-Seltzer commercial used to say, "Try it, you'll like it."
See also: The UK Catholic Truth Society Website