I am adding observations to this project by looking through all bat observations uploaded to iNaturalist that include photos. To avoid looking over the same observations twice, I am going in order of when the observations were uploaded. It's actually pretty quick work since most observations are photos of the bats themselves so it's just quick scrolling and picking out the spectrogram observations and opening them in a separate from tab. From there I use my keyboard to quickly go through all of the tabs and add them to the project using keyboard shortcuts!

As of today, 4/30/20 (11PM Eastern time in the US), I have gone through all bat observations uploaded from May 1st 2019 to today, April 30th 2019. This means to keep this project up to date I will need to keep working backwards but also adding the spectrogram observations as they are uploaded in the future. Because it doesn't take very long to add them I think I should be done going backwards pretty soon although I might get tied up with other projects! Either way this will at least help me get organized in adding observations. You can also help by adding any spectrogram observations you upload or find!

Here is the link I am using to find observations that are not in the project:
https://www.inaturalist.org/observations?created_d2=2019-04-30&has%5B%5D=photos&not_in_project=bat-spectrograms&photos&place_id=any&subview=grid&taxon_ids=40268
It is set to start with observations uploaded on April 30th, 2019 so nobody wastes their time looking for spectrograms uploaded in the last year. There are a few that I couldn't add to project because the users don't allow it but I messaged them to see if they would join the project and upload their observations.

Thanks for any help you can provide in going through calls! Please comment if you do add any with the link above!
Joe