German standard methods for the examination of water, waste water and sludge; cations (group E), determination of nine heavy metals (Ag, Bi, Cd, Co, Cu, Ni, Pb, Tl, Zn) (E21)— 8 стр.
German standard methods for the examination of water, waste water and sludge; parameters characterizing effects and substances (group H); determination of filterable matter and the residue on ignition (H 2)— 12 стр.
Lead acid batteries; stationary cells with positive tubular plates; cells in hard-rubber containers; rated capacities, main dimensions, weights— 5 стр.