search materials(including e-books and e-journals) held by Hokkaido university.
search materials held by universities in Japan.
search information on academic articles published in Japan.
search NDL(National Diet Library) online, NDL Digitized Contents and "Aozora Bunko", materials of a Japanese digital library.
Search keyword：(Subject: #Observers' manuals)
The meteorological observer's handbook : approved for the use of observers by the Meteorological Office and the Royal Meteorological Society
1921 ed,1926 ed.. - London : H.M.S.O. , 1921-
(Meteorological office ; 191 ; (1921, 1926))
Celestial objects for common telescopes / by T. W. Webb
v. 1,v. 2. - New impression. - New York : Longmans , 1911
Instructions for cooperative observers
7th ed. - Washington, D.C. : Government Printing Office , 1924
Notes on geomagnetic observatory and survey practice / by K.A. Wienert
[Paris] : Unesco , 
(Earth sciences ; 5)
(Document ; SC.68/D.64/A)
Looking through a telescope / by Linda Bullock ; consultants, David Larwa, Nanci R. Vargus
: pbk.. - New York : Children's Press , c2003
(Rookie Read-About Science)
Looking at cities / Allan B. Jacobs
Cambridge, Mass. : Harvard University Press , 1985