Yes, that's right: Working from outside of the USSR, they convened a group and produced an admittedly limited account of the incident. Three years later, when t

Yes, that's right: Working from outside of the USSR, they convened a group and produced an admittedly limited account of the incident. Three years later, when the Soviet regime finally requested (limited) help, and they did their best. A decade later, they revisited the issue, and made the decision not to use the results from many other studies that had been attempted, because they weren't necessarily scientifically rigorous. That was probably right decision, and I find it entirely plausible that they did great work given the enormous limitations that they faced, but there is only so much you can do when the authoritarian regime standing in your way happens to finally disintegrate, years later.