This is a rare (on this blog) report in English, from the Aberdeen Proving Grounds in Maryland, USA, titled Protection provided by steel and aluminum armor against fragments from high-explosive ammunition (U). To aid potential Googlers in finding it, I’ll list some identifying numbers.
Report No. DPS-67
OMS Code 5510.11.268
D. A. Project No. 548-03-001

The report seems to have ended up in a Swedish archive via official channels; it appears to have been forwarded via the Swedish military attache in Washington DC. Some appendices are missing, presumably removed by the DoD before the report was handed over to foreign hands.