000 00275nam a2200073 4500
080 _a
_b
245 _aBS-1991 - Part 4 - 1961; Recommendations for letter symbols, signs and abbreviations Part 4 Structures, Materials and Soil Mechanics
700 _aBritish Standards Institution
260 _aLondon
_bBSI
_c1961
300 _a49p
999 _c24703
_d24703