According to the schematic, the midband gain is 100, with a -3dB bandwidth of 0.16Hz to 22Hz.
U1A, U1B, U2B, R2, R3, R8 and R9 make up a differential amplifier with a gain of -10. U2A, R5 and R6 make up an amplifier with a gain of -10.
The midband output voltage is
OUTpos=[-INpos*(R3/R8) + INneg*(1+R3/R8)*(R9/(R2+R9))]*(-R6/R5)
Gain=OUTpos/(INpos-INneg)
Since R2=R8=10k, R3=R9=100k, R5=100, and R6=1k, the midband gain is, as I said, 100.
The low frequency corner is Fc1=1/(2*pi*R10*C1)
The high frequency corner is Fc2=1/(2*pi*R4*C3).