Ronald Reagan plays a liberal college professor in “She’s Working Her Way Through College,” one of seven lesser-known musicals debuting on DVD today at the Warner Archive. Reagan defends the academic freedom of burlesque queen Virginia Mayo to perform Shakespeare in this musical version of “The Male Animal,” with the future president, Phyllis Thaxter and Don (“Hazel”) DeFore stepping into the roles Henry Fonda, Olivia DeHavilland and Jack Carson played in the 1942 film, already available at the WA. Mayo and co-star Gene Nelson are also featured in “She’s Back on Broadway,” which is not a sequel. Nelson, later a busy TV director of series like “M*A*S*H,” also pops up in “The Daughter of Rosie O’Grady” with Fox’s June Haver in the lead opposite Gordon MacRae and with teenage Debbie Reynolds in her screen debut. There’s also Michael Curtiz’ long-unseen 1952 remake of “The Jazz Singer” starring Danny Thomas (Marlo’s dad) and Peggy Lee. Elliot Nugent, who co-wrote “The Male Animal” with James Thurber and directed the movie version (along with a number of others) co-stars with Robert Montgomery in the obscure 1929 musical “So This is College,” with Montgomery also represented by the uber-obscure golf musical “Love in the Rough.” The rarest release in the bunch — I wasn’t aware it even still existed — is the 1930 musical “Sweet Kitty Bellairs,” starring Claudia Dell (most famous as the original model for the Columbia Pictures logo) in the title role opposite a singing Walter Pidgeon, who would not achieve stardom for another decade, and then in dramatic roles. Originally all in two-strip Technicolor, it only survives in black-and-white.