LANDING, E. & JOHNSON, M. (eds) 1998. Silurian Cycles. Linkages of Dynamic Stratigraphy with Atmospheric, Oceanic, and Tectonic Changes. James Hall Centennial Volume. New York State Museum Bulletin no. 491. ix + 327 pp. New York: New York State Museum and New York State Education Department. Price US $40.00 (paperback). ISBN 1 55557 206 5; ISSN 0278-3355.

2000 ◽  
Vol 137 (1) ◽  
pp. 97-106
Author(s):  
Nigel Woodcock
1976 ◽  
Vol 23 (7) ◽  
pp. 551-553
Author(s):  
John J. Sullivan

During the 1973-74 school year. two sixth-grade classes in New York conducted classroom tri als of hand-held calculators. Each child in these classes had a Bowmar “Brain” hand-held calculator for his usc during mathematics lessons each day. The project was organized by the Bureau of Mathematics Education, New York State Education Department. The calculators were provided free of charge by Bowmar/ALl, Inc., and supervision was provided by the principals of the project schools.


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