Subroutine: ZEROS.F computes the zeros of the Bessel function J or its
	        derivative J' and stores a table to an array. This array
                may be written to a file for later use. I used it to compute
                cylindrical waveguide modes. 

    Author:     Louis Wilson
	     	20047 Strathern St.
	     	Canoga Park, CA 91306

    Bus. phone: (818) 847-0868
    Home phone: (818) 718-9692
    E-Mail:     louis@wizard.ladc.lockheed.com

    Libraries:  Numerical Recipes

    References: Numerical Recipes
		W. H. Press, B. P. Flannery, S. A. Teukolsky, W. T. Vetterling
		Cambridge University Press, 1989

		Handbook of Mathematical Functions
		M. Abramowitz and I. A. Stegun editors.
		National Bureau of Standards - AMS 55

    Comments:   This is a very simple subroutine, but I looked around and
		asked around and could find no references on how to to it.
		Hopefully this will be helpful to someone. If you find
		any bugs please let me know.