Orders for the 1970 proof specimens were not cut off until Dec. 31, 1969.
No Shield nickels were struck in 1877 or 1878, excepting proof specimens for collectors.
The mintage for 1876 was low (coining took place at Philadelphia and Carson City), and only proof specimens were coined in 1877 and 1878, at Philadelphia.
Then there's Graham ― a bulging, unsightly and very crash-proof specimen.
One of the surviving specimens of the mostly melted rounded rim pieces is in proof; this unique specimen is in private hands.
They also mention that a complete absence of air bubbles in the rock slabs is further proof that the specimen is authentic.
With the increase of σ2, the temperature change area is planar of rock specimen which proofs that the failure mode of rock specimen turns into slabbing.
While evidence that a species was present at a given point in space and time is largely irrefutable (the specimen is the proof!), unambiguous evidence that a species is absent is more difficult to obtain.
Place the specimen in a leak proof secondary container before putting in the x-ray cabinet, and keep the specimen in the secondary container during x-ray process.
The animal had never before been photographed; the only previous proof of its existence was a specimen collected by Willoughby Lowe, the British explorer for whom the animal is named, in 1932.
