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Here's how I got all items for Dimostrare la propria forza in a timely manner:

Started off at Affliction Ridge (roughly 46,64) and got:

Cristallo Elementale from Furia del Vapore Increspata
Occhio di Gronn from Scagliarocce Gronn
Scaglia di Protogronn from Protogronn Spaccaossa
Bocciolo di Botani from Botani Guardiaverde
Dente di Goren Macchiato di Acido from Goren Strappaocchi

I then went north to the Ogron cave at 43.6 48.2 for:

Corno Consumato di Ogron from Ogron Spaccaossa

Back south to Mistcreep Mire (50,69) for:

Pungiglione di Vespa from Pungitore Tetranebbia
Squama di Basilisco from Basilisco del Pantano

And lastly, I ran south out of the mire into Razorbloom (48,74) for:

Spina di Orco from Orco Infestato
Artiglio di Devastatore from Devastatore Verdeggiante
Ramo di Antico from Difensore Germogliante

The last group at Razorbloom is a bit tricky to get in one go, but grab a coffee in between or something ;) (or write a WoWhead post like I did now). To get from the Bloom Defender at 48,74 to the ravagers and orcs on the other side easily you can get through the thorns surrounding the defender at 48.15 , 74,93.
Of course you can also do it in a different order per group, I did it on the spot. In the end you got 10 minutes in between each time so it won't get any faster than 40-50 minutes anyhow.

Hope this helps! Good luck!

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Scaglia di Protogronn

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"Una scaglia gigantesca, in parte costituita di pietra."