On topic? Looking for old computer book

I hope you don't mind me asking as this is not a tech quiestion per se, but if anyone in the world will know the answer it will be this group. I'm looking for a book that I rented from a library in 1973 or 1974 on computers. In the back of the book it has plans for building a computer out of basic components, including a telephone dial for input. The output is shown on lights and I remember there being more than a few bulbs. The "computer" probably does nothing more than add numbers. I use the book to research and write my 8th grade science paper and then I tried to build the computer for my 8th grade project but could not complete it at the time. Now that I'm older and wiser I figured I'd try again.... (mid life crisis?) I don't remember any ICs. It was pretty simple electrical components. Anyone know the title or author of this book? Thanks. Paul