00290cam a2200109ua 4500041001000000082001600010100001700026245008000043260004000123300001200163504000500175  aengh  a691bBUL/PL  aBulatov, A .  aPlugging materials and cementing of wells / cA.Bulatov.hTextual Documents  aMoscow : bMir publishers , c1982.  a295 ; .  a