NOW READY. price Is. and Is. Ild. nett, postage 3d., THE PRACTICAL ENGINEER POCKET BOOK AND DIARY. 1939, rev• ..
... NOW READY. price Is. and Is. Ild. nett, postage 3d., THE PRACTICAL ENGINEER POCKET BOOK AND DIARY. 1939, rev•-ed and enlarged; also NOW READY, price Is. and Is. ed. nett, postage 21d., THE PRACTICAL ENGINEER ELBCTRICAL POCKET BOOK iLkd DIARY. 190e ...