Series already set up, but needs existing books added, please :)

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Hello and thanks!

This is something I don't see every day - someone has kindly set up the series, but the books aren't all tethered to it!

Branxome Family Series
https://www.goodreads.com/series/2014...
#1 Jan's Treasure
#2 The Chesterfield Gold
#3 The Missing Panel
#4 The Dahlia's Cargo
The Eisenbart Mystery
Don John's Ducats
Nepomuk of the River

Book 1 is Senojo Jano lobis, or in English (edition not added), Jan's Treasure: https://www.amazon.com/Jans-Treasure-... if you'd like to add it. :)

Book 2 is The Chesterfield Gold

Book 3 is not on GR ( https://www.abebooks.com/servlet/Book... ) "The Missing Panel"

Book 4 is simply not linked: The Dahlia's Cargo

Books 5 - 7, order unconfirmed:
Nepomuk of the River does involve the boat The Dabchick that all the others are set on (and seemingly the same characters - Stella's Books backs that up as well).
Don John's Ducats could be added to Goodreads as well, which Peakirk asserts/confirms is part of this series (they also don't seem to know the sequence, though): https://www.abebooks.de/servlet/BookD...
The Eisenbart Mystery could similarly be added to Goodreads: https://www.amazon.co.uk/dp/B0017DLKF...

So I'm not too sure what else can be done here by you wizards. ;) But at the very least, Book 4 can be set into place (and an English ed. for Book 1 added, Book 3 'The Missing Panel' and Unnumbered Books 'Don John's Ducats' and 'The Eisenbart Mystery' can be added, if you are so inclined to do so).

These books seem very scarce (pity, because I would like to read the set!!!), and I really can't find a good source for info on those last three. :( At least one is in the public domain now, so... hope springs eternal. ;)

Many thanks for any help you can provide. :)

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Update - Book 3, "The Missing Panel" can be read on InternetArchive! :D
https://archive.org/details/missingpa...

... and it's rather useless, re: series info. Nevermind. ;)