IGEM/GL/2 Edition 3 - Planning of gas transmission and storage systems operating at pressures exceeding 16 bar - Digital (3 year)
IGEM/GL/2 Edition 3 - Planning of gas transmission and storage systems operating at pressures exceeding 16 bar - Hard copy
IGE/GL/1 Edition 3 - Planning of gas distribution systems of maximum operating pressure (MOP) not exceeding 16 bar - Digital (3 year)