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### Source/destination types
```csharp
jToken.SelectTokens("$..book[?(!@.isbn)]")
```
or
```csharp
jToken.SelectTokens("$..book[?(@.isbn == null)]")
```
### Source/destination JSON
```j…
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### Evidence / Screenshot (if possible)
### Relevant url?
### Steps to Reproduce
1. Call https://openlibrary.org/api/books?bibkeys=ISBN:9781741795226&jscmd=data&format=json
2. Read Res…
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Sometimes identifiers need to be qualified, a common distinction is the isbn for the paperback. On [this example](http://id.loc.gov/tools/bibframe/compare-lccn/full-ttl?find=2015298246) it uses:
``…
eroux updated
4 years ago
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Related material: https://academia.stackexchange.com/questions/41688/how-to-represent-and-cite-a-patent-using-bibtex
## Goal
when using `@datasheet`, etc. Qiqqa should recognize it sufficiently…
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Hi,
In order to improve data for old book it will be nice to add a field ocn.
For book too old for getting an isbn the current state of art number is the ocn. Wikipedia use it and major catalog …
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According to https://wiki.librarything.com/index.php/Adding_and_importing_books this is expected behaviour
> Universal Import does not read any data from your file other than valid ISBNs, if they'r…
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When a user enters a valid ISBN for their book and attempts to use the cover generator tool, the export fails at the barcode generation stage and the user sees a default WordPress error `File is empty…
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How do you know an ISBN is invalid? There is no validation.
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Hello,
I have created a library under the username (nazmin.shaikha@gmail.com). However I am having issues uploading my csv file. It threw an error as 'Please provide a valid ISBN 13 number. Numeric …