1. The ordinates in figures 2 and 8 should read:       A (dB) cos i₀
2. The ordinate in figure 3 should read:       _||R_|| (dB) cos i₀
3. The paragraph following equation (5) on page 13 should read:

         Let h₂ be the height where Z = 1. The decrease of Z with height combined with (2) requires that h₂ > h₁. We thus have three regions of the ionosphere to consider: (I) below h₁, (II) between h₁ and h₂, and (III) above h₂.

4. The paragraph following equation (6) on page 13 should read:

         There are three cases to consider for the reflection of LF and VLF waves from the D region; these correspond to whether reflection occurs in regions I, II, or III defined above.

5. The following should be added to the right-hand-side of equation (27) on page 29:

   -20/(Log 10) (2 r₀ c)/(a+b) N(h₁)/f_H

6. Replace "4 r₀² c² N²" by "4 r₀² c⁴ N²" in the radical in the denominator of the integral in Table 4.
7. Insert a minus sign in a factor in that same formula in Table 4 so that the factor reads .
8. Add the accompanying tables 6, 7, and 8 to the report.

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http://cires.colorado.edu/people/jones.mike/pubs/errata4.htm, was last updated 2 May 2003.