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We confirm 66 low-mass stellar and brown dwarf systems (K7-M9) plus 19 visualor spectroscopic companions of the beta Pictoris Moving Group (BPMG). Of these,41 are new discoveries, increasing the known low-mass members by 45%. We alsoadd four objects to the 14 known with masses predicted to be less than 0.07Msun. Our efficient photometric+kinematic selection process identified 104low-mass candidates which we observed with ground-based spectroscopy. Wecollected infrared observations of the latest spectral types (>M5) to searchfor low gravity objects. These and all <M5 candidates were observed withhigh-resolution optical spectrographs to measure the radial velocities andyouth indicators, such as lithium absorption and H-alpha emission, needed toconfirm BPMG membership, achieving a 63% confirmation rate. We also compiledthe most complete census of the BPMG membership with which we tested theefficiency and false-membership assignments using our selection andconfirmation criteria. We assess a group age of 22 +/- 6 Myr using the newcensus, consistent with past estimates. With the now densely sampled lithiumdepletion boundary, we resolve the broadening of the boundary by either an agespread or astrophysical influences on lithium burning rates. We find that 69%of the now known members with AFGKM primaries are M stars, nearing the expectedvalue of 75%. However, the new IMF for the BPMG shows a deficit of 0.2-0.3 Msunstars by a factor of approximately 2. We expect that the AFGK census of theBPMG is also incomplete, probably due to biases of searches towards the neareststars.

All-sky Co-moving Recovery Of Nearby Young Members. (ACRONYM) II: The Beta Pictoris Moving Group