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document.write(' <a href="1956.html" >1956</a> |');
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document.write(' <a href="1957.html" >1957</a> |');
document.write(' <a href="1957_2.html" >1957 P2</a> |');
document.write(' <a href="1957_3.html" >1957 P3</a> |');
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document.write(' <a href="1958.html" >1958</a> |');
document.write(' <a href="1958_2.html" >1958 P2</a> |');
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