Akita-Kozan-Semmon-Gakko (Akita Mining College), Akita, Japan, via U.S.A.

Allen, Edward G. & Sons, Limited, 12 and 14, Grape Street, Shaftesbury Avenue, London, W.C.2.

Arcos, c/o J. B. Davies, W. H. Smith and Son, Export Department,186, Strand, London, W.C.2.

Bristol Central Library, The City Librarian, Bristol.

California State Library, Sacramento, California, U.S.A.

Cambria Free Library, Johnstown, Pennsylvania, U.S.A.

Chikuho-Kozan-Gakko, Naogatamachi, Kurategun, Fukuoka-ken, Japan.

Civil Engineering College, The Principal, Sibpur, Howrah, India.

Coal Association, H. D. L. Minton, General Buildings, 2nd Floor, Aldwych, London, W.C. 2.

Consolidated Gold-Fields Of South Africa Limited, Limited, Engineering Department,8, Old Jewry, London, E.C. 2.

Crerar, John, Library, Chicago, Illinois, U.S.A.

Detroit Public Library, The Librarian, Detroit, Michigan, U.S.A.

Ecole Des Maitres Mineurs, Alais, Gard, France.

General Assembly Library, The Librarian, Wellington, New Zealand.

Guggenheim Brothers, 120, Broadway, New York City. U.S.A.

Harvard College Library, Cambridge, Massachusetts, U.S.A.

H.M. Stationery Office, Superintendent Of Publications, Book Department, Princes Street, Westminster, London, S.W.1.

Imperial College Of Science And Technology, The Clerk For Supplies, South Kensington, London, S.W.1.

Kusaba, Y., c/o Oshima Colliery, Kurosemura, Nishisonoki-gun, Nagasaki-ken, Japan.

Lemcee & Buechner, 30-32, East 20th Street, New York City, U.S.A.

Meiji-Semmon-Gakko, Tobata, Fukuoka -ken, Japan.

Meulenhoff, Librairie, Damrak 88, Amsterdam, Holland.

Missouri, University Of, The LIBRARY, School of Mines and Metallurgy, Rolla, Missouri, U.S.A.

Mitchell Library, The Librarian, North Street, Glasgow

Mitsubishi-Kamiyamada-Tanko, Kamiyanmada, Kaho-gun, Fukuokaken, Japan.

Mitsubishi-Kogyo-Kenkyujo, Ohi-Machi, Tokyo, Japan.

Mitsubishi Mining Company, Maru-No-Uchi, Tokyo, Japan.

Nathan, Walter, The Chinese Engineering and Mining Company, Limited, Tientsin, Pe-chili, North China, via Siberia.

New South Wales Public Library, The Principal Librarian, Sydney, New South Wales, Australia.

New York Public Library, Forty-Second Street and Fifth Avenue, New York City, U.S.A.

Nishida, N., c/o Takata and Company,57, Bishopsgate, London, E.C. 2.

Pei-Yang University, The Librarian, Tientsin, Pe-chili, North China, via Siberia.

Royal Scottish Museum, Edinburgh.

Ryojun-Koka-Gakudo, Port Arthur Technical Institute, Port Arthur, South Manchuria, China.

Science Museum, The Keeper, Science Library, South Kensington, London, S.W. 7.

Simpkin, Marshall, Hamilton, Kent & Company Limite, Mr. Gander, Country Department, 31-32, Paternoster Row, London, E.C. 4.

Solvay & Cie, Administration Centrale, 33, rue de Prince Albert, Brussels, Belgium.

Sotheran, Henry & Company, 43, Piccadilly, London, W.1.

Stechert, G. E. & Company, 2, Star Yard, Carey Street, London, W.C.2.

Technical Press Limited, The Mines Building, 426, Homer Street, Vancouver, British Columbia.

Tokyo Imperial University, Mining Department, College of Engineering, Tokyo, Japan.

Tokyo Imperial University, Metallurgical Department, College of Engineering, Tokyo, Japan.

United States Patent Office, Scientific Library, Washington, D.C., U.S.A.

Walker Brothers (London) Limited, Limited, 36, Basinghall Street, London, E.C.2.

Whitcombe & Tombs, Christchurch, New Zealand.