| Entry | Volume | Pages |
|---|---|---|
| Tjaden, W. (Will) L.: A Note on Campanula isophylla and Campanula fragilis | 33 | 178 |
| Tjaden, W. (Will) L.: A Note on Flower Photography and a Book Review | 35 | 84 |
| Tjaden, W. (Will) L.: Alpines in Colour: -Primula minima | 38 | 38 |
| Tjaden, W. (Will) L.: Primula hirsuta and Campanula alpestris, Some More Changes of Name | 38 | 244 |
| Tjaden, W. (Will) L.: Sempervivums - Yellow Flowered | 37 | 97 |
| Tjaden, W. (Will) L.: The Grisons, Arosa | 35 | 263 |
| Tjaden, W. (Will) L.: The Schachen Alpine Garden | 36 | 260 |
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