Members receive hardcopies of Probe as soon as they are printed. Probes are made available for free download in PDF format, except for the latest two editions, which are only offered to members.
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Full-size images have variable sizes between 100K (very old) and 8 MB (more recent). Most of the PDF documents have variable sizes, usually between 2 and 8 MB. The 50th Anniversary issue #180 contains many photographs, and is 35MB!
All issues of Probe are in pdf format