On p. 20 of an article by Borwein et al., it is stated that Ramanujan could generalize the following formula due to Glaisher $$\gamma = 2 - 2\log2 -2\sum_{n=3, \text{ odd}} \frac{\zeta(n)-1}{n(n+1)} $$ to infinitely many formulae for $\gamma$. They refer to Section 19 of Ramanujan's collected papers (which I don't have in my possession).

I wonder what this collection of series representations for $\gamma$ is, and whether it can be found in another (open-source) reference -- preferably including a derivation.