Hierop staat in Engels kortschrift:
(begin citaat)
the international braille code for mathematics and chemistry
approved by VII. committee appointed by the international blind congress held in vienna, 1929
with an introduction by col. h. l. stafford,
british representative on the committee
in one pamphlet
publishers: the national institute for the blind, 224, great portland street, london w.
printed and published by the national institute for the blind
great portland street,
london w.
1941
(einde citaat)