estimation of LC50 value

[Pat Edwards]

Last week, I posted a request for some journal reprints from Papiya Deb
of India who was having difficulties obtaining information for his/her
research.  I received the following message from Dr. Deb this morning.
If any of you can provide some help, it would be most appreciated.

Pat Edwards
************************************************************

Dear Pat,

Thank you for your mail and for the kind co-operation you have extended
to me. As regards to my queries that you have so kindly posted to the
researchers, I have already received one reply from a researcher in 
The Netherlands and am eagerly waiting for a few more as he has been 
able to locate only three of the necessary 15.

Presently I am in a dilemma as I require a fulproof method for
estimation of LC50 value for various toxic water soluble pollutants. I
had tried to locate the following paper

Litchfield, J, T. and Wilcoxon, F. (1949). A Simplified method for
evaluating dose   effect experiments. Journal of Pharmocology Exp. Ther.
96, pp. 99-113

I have also come to know that this LC50 evaluating method can be got
from

Woolf, C.M. Principles of biometry (D.Van Nostrand Co. Inc,          New
Jersey) 1968,  293

I could not get the papers as my University library does not have it.
Could you kindly help in this regard?