Dear Keith,

First allow me to apologize for not answering your letter 
sooner. Partly it is bound up with repairs in some rooms of 
our laboratory, therefore I was obliged to be in vacation over 
a long period of time.  
     This diskette contain 
 - new ring width data of samples collected in 1993 (subd. 
"93") and list of these samples (93.lst). Not all samples 
measured today; 
 - some series that were missing in first portion of data 
(subd. "82"); 
 - some corrected series (subd. "CORR"); 
 - data of densitometric analysis of some samples 
(yamalsf1.ser), list of these samples (dens.lst) and 
separately ring width data of these samples (subd.  
"DENS\RW"); 
 - list of new floating chronologies (float.lst);
 - list of samples that prepared for radiocarbon analysis in 
Switzerland (c-14.lst).

For some trees collected in 1993 there are two and more 
series. Several of these have been crossdated. For these 
series as well as for series NN 8 up to 23 zeros means missing 
rings. For other series measured by Surkov zeros are very thin 
ring width, less then 1. Three zeros in succession means 
potential gap (crack, rotten wood etc.).