International license. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution...
English Report of the Puerto Rico Experiment Station - 1950 applies to jurisdiction: United States of America determination method: work of the federal government...
{{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag. Note: This tag applies to scans and photocopies only. For photographs of public...
