Wikipedia suggests: The Adventures of Odd and Elsewhere (1971) The Secret Of The Seven Bright Shiners (1972) Elsewhere and the Gathering of the Clowns (1974) Odd and the Great Bear (1974) The Return Of The Great Bear (1975 May) ISBN 978-0-233-96647-2 Odd to the Rescue! (1975) The Secret Of Tippity Witchit (1975 October) [4] The Lost Treasure Of Wales (1977)
I'm not surprised they're hard to find; more that there aren't fansites where people discuss them, or at least blog entries other than this one where someone reminisces about them.
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The Secret Of The Seven Bright Shiners (1972)
Elsewhere and the Gathering of the Clowns (1974)
Odd and the Great Bear (1974)
The Return Of The Great Bear (1975 May) ISBN 978-0-233-96647-2
Odd to the Rescue! (1975)
The Secret Of Tippity Witchit (1975 October) [4]
The Lost Treasure Of Wales (1977)
I'm not surprised they're hard to find; more that there aren't fansites where people discuss them, or at least blog entries other than this one where someone reminisces about them.