For anyone interested in how machines like the LGP-30 worked, there's a book titled Basics of Digital Computers by John S Murphy, nominally in 3 volumes, though

For anyone interested in how machines like the LGP-30 worked, there's a book titled Basics of Digital Computers by John S Murphy, nominally in 3 volumes, though you'll most likely find the combined edition. Though the title sounds similar to modern yellow-jacketed dross, this book was published in 1958 and the ‘basics’ go down to vacuum-tube circuits for arithmetic and control.