He wrote to the Polish Academy of Sciences in Warsaw , describing the material 's location and suggested using mine detectors to find the metal boxes containing the material .
In 1960 , Heinrich realized that he would never return to access the Asian Ichneumoninae material he had hidden .
Heinrich wrote to the Polish Academy of Sciences in Warsaw , describing the material 's location and suggested using mine detectors to find the metal boxes containing the material .
In 1960 , Heinrich realized that he would never return to access the Asian Ichneumoninae material he had hidden .