The 37 bills are among the 41 approved at end-March. The Podemos party has insisted on more debate over the approved bills to annul an opening paragraph in each of them.
Three of the total 44 bills have yet to be approved.
MAS lawmaker Jorge Silva accused Podemos senators of having an "obstructionist attitude," ABI reported.
The contracts were signed under the nationalization program of President Evo Morales, also of MAS.
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