Development of a strategy for sampling tree rings /

Mode of access: Internet.

Une pièce unique du Musée Kraus de Florence /

"Edition des 'Annales de l'Alliance Scientifique Universelle.'"

Rings of operators.

"Prepared with the assistance of a grant from the Research Corporation."

Palladius on husbondrie : from the unique MS. of about 1420 A.D. in Colchester Castle /

Mode of access: Internet.

Unique collection letters,

Mode of access: Internet.

The Combined Release and Radiation Effects Satellite Program, CRRES : a unique series of scientific experiments.

Mode of access: Internet.