On Wednesday, February 28, 2018 at 8:52:32 PM UTC-5, John Clark wrote:
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> On Wed, Feb 28, 2018 at 5:59 PM, <[email protected] <javascript:>> 
> wrote:
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> *​> ​It was on hyper sensitizing photographic emulsions, maybe in 1967, 
>> and probably a second one same year. AG*
>>
>> One of the co-authors;  
>>
>  
>
>> * https://en.wikipedia.org/wiki/David_Morrison_(astrophysicist) 
>> <https://en.wikipedia.org/wiki/David_Morrison_(astrophysicist)>*
>>
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>
> ​Could you be Edward H Greenberg? He wrote a paper on that subject with 
> Morrison 1968 but Sagan was not one of the authors, although he is 
> mentioned in the acknowledgments.   
>
> http://adsabs.harvard.edu/full/1968AJ.....73..518M 
>

*Was there a second paper that year, possibly with Sagan as co-author? AG*

>
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> ​John K Clark​
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